Model ST-1301 Light Meter Instruction Manual reedinstruments www com
Table Of Contents Features... 2 Specifications... 3 Panel Description... 4 Operating Instructions...5-6 Battery Replacement... 6 Features Easy to use, pocket size and light weight 3 1/2 digital LCD display with LUX, Fc, LOBAT, MAX, HOLD indication Accurately displays light level in terms of Foot Candles (Fc). or Lux over wide range Measures from 0 to 50000 Lux/ Fc in four ranges. with resolution 0.1Lux/Fc Max Hold and Data Hold Auto Power Off
Specifications Display: 1999 counts LCD display with LUX, Fc,. LOBAT, MAX, HOLD indication Polarity: Automatic, (-) negative polarity indication Over-range: 1 mark indication Low battery indication: The BAT is displayed when the battery voltage. drops below the operating level Measurement rate: 1.5 times per second, nominal Storage temperature: -10 C to 60 C (14 F to 140 F). at <80% relative humidity Auto Power Off: Meter automatically shuts down after. approx. 15 minutes of inactivity. Power: One standard 12V, A23 battery. Dimensions/Wt.: 188 (H) x 64.5 (W) x 24.5 (D) mm/160g Photo Detector. Dimensions/Wt.: 115 X 60 X 27 mm/80g Light Measuring Range: 200, 2000, 20000, 50000 Lux/Fc (1Fc=10.76 Lux) Accuracy: +5% rdg + 10dgts (< 10,000Lux/Fc) Accuracy: +10% rdg + 10dgts (> 10,000Lux/Fc). (20,000Lux range reading x. 10, 50,000Lux range reading x100) Overrate Display: Highest digit of 1 is displayed (calibrated to. standard incandescent lamp. at color temperature 2856 k) Repeatability: +2% Temperature Characteristic: +0.1%/ C Photo detector: One silicon photo diode with filter 3
Panel Description 1- LCD display: 1999 counts LCD display with. LUX, Fc, LOBAT, MAX, HOLD indication 2- Power /Function/Range switch: Turn power ON or OFF. and select measurement function and ranges. 3- Photo Detector: Long life silicon photo diode inside 4- MAX. HOLD: If you press the MAX. button, the maximum reading. will be held. Pressing the button once again, will release the hold and allow a further measurement. 5- DATA HOLD: The reading will be held when the Data Hold button. Switch is pressed. If the button Switch is pressed once again,. it will release the hold and allow a further measurement. 6- Function button: Selects measurement functions of Lux or Fc
Operating Instructions Measuring Light 1. Turn the Power/Function/Range switch to select the range to desired (x1 Lux/Fc, x10lux/fc, x100lux/fc) range. 2. Remove the photo detector to the light source in a horizontal position. 3. Read the illuminance nominal from the LCD display. 4. Over-range: If the instrument only displays one 1 in the M.S.D. the input signal is too strong, and a higher range should be selected. 5. When the measurement is completed, replace the photo detector from the light source. 6. Spectral sensitivity characteristic: To the detector, the applied photo diode with filters makes the spectral sensitivity characteristic almost meet C.I.E. (International Commission on Illumination) photopia curve V( ) as the following chart described. y 100% (Relative Sensitivity) Spectral Sensitivity 80% V( ) 60% 40% 20% 0 400 500 600 700 Wavelength (nm) y 5
7. Recommended Illumination: Locations Lux *Office Conference, Reception room 200 ~ 750 Clerical work 700 ~ 1,500 Typing drafting 1000 ~ 2,000 *Factory Packing work, Entrance passage 150 ~ 300 Visual work at production line 300 ~ 750 Inspection work 750 ~ 1,500 Electronic parts assembly line 1500 ~ 3,000 *Hotel Public room, Cloakroom 100 ~ 200 Reception, Cashier 200 ~ 1,000 *Store Indoors Stairs Corridor 150 ~ 200 Show window, Packing table 750 ~ 1,500 Forefront of show window 1500 ~ 3,000 *Hospital Sickroom, Warehouse 100 ~ 200 Medical Examination room 300 ~ 750 Operating room Emergency Treatment 750 ~ 1,500 *School Auditorium, Indoor Gymnasium 100 ~ 300 Class room 200 ~ 750 Laboratory Library Drafting room 500 ~ 1,500 Battery Replacement If the sign BAT appears on the LCD display, it indicates that the battery should be replaced. Open the battery case and replace the expired. battery with new battery. (1 x 12V battery, A23 or equivalent)
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